Kyle Larson's car (32) goes airborne after a last-lap crash; large chunks of debris from his car injured fans.

Photo: Jerry Markland, Getty Images

Kyle Larson's car (32) goes airborne after a last-lap crash; large...

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An injured spectator is tended to by emergency personnel.

Photo: David Graham, Associated Press

An injured spectator is tended to by emergency personnel.

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DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32 Clorox Chevrolet, Justin Allgaier, driver of the #31 Brandt Chevrolet, Brian Scott, driver of the #2 Shore Lodge Chevrolet, Parker Kligerman, driver of the #77 Bandit Chippers Toyota, and Brad Keselowski, driver of the #22 Discount Tire Dodge, are involved in an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Chris Graythen/Getty Images)

Photo: Chris Graythen, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32...

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DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32 Clorox Chevrolet, gets out of his car following an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Jonathan Ferrey/Getty Images)

Photo: Jonathan Ferrey, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32...

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DAYTONA BEACH, FL - FEBRUARY 23: Ambulances sit on the track after emergency officials responded to an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Jonathan Ferrey/Getty Images)

Photo: Jonathan Ferrey, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Ambulances sit on the track after...

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DAYTONA BEACH, FL - FEBRUARY 23: Emergency officials respond to an incident that sent debris into the stands at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Matthew Stockman/Getty Images)

Photo: Matthew Stockman, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Emergency officials respond to an...

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DAYTONA BEACH, FL - FEBRUARY 23: Officials carry debris from the stands after an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Matthew Stockman/Getty Images)

Photo: Matthew Stockman, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Officials carry debris from the...

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DAYTONA BEACH, FL - FEBRUARY 23: Aftermath of an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Jonathan Ferrey/Getty Images)

Photo: Jonathan Ferrey, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Aftermath of an incident at the...

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DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32 Clorox Chevrolet, and Regan Smith, driver of the #7 Clean Coal Chevrolet, are involved in an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Matthew Stockman/Getty Images)

Photo: Matthew Stockman, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32...

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Kyle Larson's car (32) gets airborne during a multi-car wreck on the final lap of the NASCAR Nationwide Series auto race Saturday, Feb. 23, 2013, at Daytona International Speedway in Daytona Beach, Fla. (AP Photo/David Graham)

Photo: David Graham, Associated Press

Kyle Larson's car (32) gets airborne during a multi-car wreck on...

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Emergency help injured spectators in the upper level of the front grandstand at Daytona International Speedway after a wreck on the final lap of the DRIVE4COPD 300 at Daytona International Speedway in Daytona Beach, Florida, Saturday, February 23, 2013 During the wreck, Kyle Larson's Chevrolet got lofted into the catch fence and the front end and engine along with other debris of Larson's car tore into the fence. (Jeff Siner/Charlotte Observer/MCT)

Photo: Jeff Siner, McClatchy-Tribune News Service

Emergency help injured spectators in the upper level of the front...

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DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32 Clorox Chevrolet, looks at his car following an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Matthew Stockman/Getty Images)

Photo: Matthew Stockman, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32...

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DAYTONA BEACH, FL - FEBRUARY 23: Drivers race during the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Mike Ehrmann/Getty Images)

Photo: Mike Ehrmann, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Drivers race during the NASCAR...

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Kyle Larson climbs out of his damaged car after he was involved in a multi-car crash on the final lap of the NASCAR Nationwide Series auto race at Daytona International Speedway, Saturday, Feb. 23, 2013, in Daytona Beach, Fla. (AP Photo/John Raoux)

Photo: John Raoux, Associated Press

Kyle Larson climbs out of his damaged car after he was involved in...

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Kyle Larson climbs out of his damaged car after he was involved in a multi-car crash on the final lap of the NASCAR Nationwide Series auto race at Daytona International Speedway, Saturday, Feb. 23, 2013, in Daytona Beach, Fla. (AP Photo/John Raoux)

Photo: John Raoux, Associated Press

Kyle Larson climbs out of his damaged car after he was involved in...

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Brad Keselowski (22) and Kyle Larson (32) slide across the finish line after they were involved in a mulit-car crash on the final lap of the NASCAR Nationwide Series auto race at Daytona International Speedway, Saturday, Feb. 23, 2013, in Daytona Beach, Fla. (AP Photo/John Raoux)

Photo: John Raoux, Associated Press

Brad Keselowski (22) and Kyle Larson (32) slide across the finish...

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Brad Keselowski (22) and Kyle Larson (32) slide down the front stretch after they were involved in a mulit-car crash on the final lap of the NASCAR Nationwide Series auto race at Daytona International Speedway, Saturday, Feb. 23, 2013, in Daytona Beach, Fla. (AP Photo/John Raoux)

Photo: John Raoux, Associated Press

Brad Keselowski (22) and Kyle Larson (32) slide down the front...

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Brad Keselowski (22) and Kyle Larson (32) slide down the front stretch after they were involved in a mulit-car crash on the final lap of the NASCAR Nationwide Series auto race at Daytona International Speedway, Saturday, Feb. 23, 2013, in Daytona Beach, Fla. (AP Photo/John Raoux)

Kyle Larson (32) goes airborne and into the catch fence during a multi-car crash involving Justin Allgaier (31), Brian Scott (2) and others during the final lap of the NASCAR Nationwide Series auto race at Daytona International Speedway, Saturday, Feb. 23, 2013, in Daytona Beach, Fla. Larson's crash sent car parts and other debris flying into the stands injuring spectators. (AP Photo/John Raoux)

Photo: John Raoux, Associated Press

Kyle Larson (32) goes airborne and into the catch fence during a...

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The engine from Kyle Larson's car sits burning next to other parts from the car near a grandstand fence after the car hit the wall and safety fence along the front stretch on the final lap of the NASCAR Nationwide Series auto race at Daytona International Speedway in Daytona Beach, Fla., Saturday, Feb. 23, 2013. (AP Photo/Phelan M. Ebenhack)

Photo: Phelan M. Ebenhack, Associated Press

The engine from Kyle Larson's car sits burning next to other parts...

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Emergency officials put out a fire from driver Kyle Larson's engine after his car hit the wall and safety fence along the front grandstands on the final lap of a NASCAR Nationwide Series auto race at Daytona International Speedway in Daytona Beach, Fla., Saturday, Feb. 23, 2013. Larson's crash sent car parts and other debris flying into the stands injuring spectators. (AP Photo/Phelan M. Ebenhack)

A spectator, center, is transported from the grandstands by emergency personnel after Kyle Larson's car hit the safety wall and fence along the front stretch on the final lap of the NASCAR Nationwide Series auto race at Daytona International Speedway in Daytona Beach, Fla., Saturday, Feb. 23, 2013. Several fans were injured when large chunks of debris flew into the grandstands. (AP Photo/Phelan M. Ebenhack)

Photo: Phelan M. Ebenhack, Associated Press

A spectator, center, is transported from the grandstands by...

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Injured spectators are treated after a crash at the conclusion of the NASCAR Nationwide Series auto race Saturday, Feb. 23, 2013, at Daytona International Speedway in Daytona Beach, Fla. Driver Kyle Larson's car hit the safety fence sending car parts and other debris flying into the stands. (AP Photo/David Graham)

Photo: David Graham, Associated Press

Injured spectators are treated after a crash at the conclusion of...

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A wheel, tire and suspension parts sit in the stands after crash on the final lap of the NASCAR Nationwide Series auto race Saturday, Feb. 23, 2013, at Daytona International Speedway in Daytona Beach, Fla. Several fans were injured when large chunks of debris sailed into the grandstands after a car flew into the fence. (AP Photo/David Graham)

Photo: David Graham, Associated Press

A wheel, tire and suspension parts sit in the stands after crash on...

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DAYTONA BEACH, FL - FEBRUARY 23: Track officials put out flames after an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Jonathan Ferrey/Getty Images)

Photo: Jonathan Ferrey, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Track officials put out flames...

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DAYTONA BEACH, FL - FEBRUARY 23: The #32 Clorox Chevrolet, driven by Kyle Larson, is seen following an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Todd Warshaw/Getty Images)

Photo: Todd Warshaw, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: The #32 Clorox Chevrolet, driven...

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DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32 Clorox Chevrolet, Justin Allgaier, driver of the #31 Brandt Chevrolet, Brian Scott, driver of the #2 Shore Lodge Chevrolet, Parker Kligerman, driver of the #77 Bandit Chippers Toyota, and Brad Keselowski, driver of the #22 Discount Tire Dodge, are involved in an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Jonathan Ferrey/Getty Images)

Photo: Jonathan Ferrey, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32...

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DAYTONA BEACH, FL - FEBRUARY 23: The #32 Clorox Chevrolet, driven by Kyle Larson, is seen following an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Todd Warshaw/Getty Images)

Photo: Todd Warshaw, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: The #32 Clorox Chevrolet, driven...

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Emergency personnel attend to injured spectators in front of the grandstands after Kyle Larson's car hit the safety wall and fence along the front stretch on the final lap of the NASCAR Nationwide Series auto race at Daytona International Speedway in Daytona Beach, Fla., Saturday, Feb. 23, 2013. (AP Photo/Phelan M. Ebenhack)

Photo: Phelan M. Ebenhack, Associated Press

Emergency personnel attend to injured spectators in front of the...

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DAYTONA BEACH, FL - FEBRUARY 23: Tony Stewart, driver of the #33 Oreo/Ritz Chevrolet, and NASCAR Nationwide Series Director Joe Balash looks at the debris of the #32 Clorox Chevrolet, driven by Kyle Larson, following an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Todd Warshaw/Getty Images)

Photo: Todd Warshaw, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Tony Stewart, driver of the #33...

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DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32 Clorox Chevrolet, Justin Allgaier, driver of the #31 Brandt Chevrolet, Brian Scott, driver of the #2 Shore Lodge Chevrolet, and Brad Keselowski, driver of the #22 Discount Tire Dodge, are involved in an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Chris Graythen/Getty Images)

Photo: Chris Graythen, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32...

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DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32 Clorox Chevrolet, and Brad Keselowski, driver of the #22 Discount Tire Dodge, are involved in an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Chris Graythen/Getty Images)

Kyle Larson's car (32) gets airborne during a multi-car wreck on the final lap of the NASCAR Nationwide Series auto race Saturday, Feb. 23, 2013, at Daytona International Speedway in Daytona Beach, Fla. (AP Photo/David Graham)

Photo: David Graham, Associated Press

Kyle Larson's car (32) gets airborne during a multi-car wreck on...

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DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32 Clorox Chevrolet, Justin Allgaier, driver of the #31 Brandt Chevrolet, Brian Scott, driver of the #2 Shore Lodge Chevrolet, and Brad Keselowski, driver of the #22 Discount Tire Dodge, are involved in an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Chris Graythen/Getty Images)

Photo: Chris Graythen, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32...

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Officials look at the engine and tire of driver Kyle Larson's car after he was involved in a multi-car crash at the conclusion of the NASCAR Nationwide Series auto race Saturday, Feb. 23, 2013, at Daytona International Speedway in Daytona Beach, Fla. Larson's car hit the safety fence sending car parts and other debris flying into the stands injuring spectators. (AP Photo/David Graham)

Photo: David Graham, Associated Press

Officials look at the engine and tire of driver Kyle Larson's car...

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DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32 Clorox Chevrolet, gets out of his car following an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Chris Graythen/Getty Images)

Photo: Chris Graythen, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32...

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DAYTONA BEACH, FL - FEBRUARY 23: Medical officials remove an injured fan from the stands following an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Jonathan Ferrey/Getty Images)

Photo: Jonathan Ferrey, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Medical officials remove an...

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Kyle Larson's car (32) gets airborne during a multi-car wreck on the final lap of the NASCAR Nationwide Series auto race Saturday, Feb. 23, 2013, at Daytona International Speedway in Daytona Beach, Fla. Tony Stewart, in the red car at front, won the race. (AP Photo/David Graham)

Photo: David Graham, Associated Press

Kyle Larson's car (32) gets airborne during a multi-car wreck on...

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Driver Kyle Larson gets out of his car, which is missing the engine, after hitting the wall and safety fence along the front grandstands on the final lap of the NASCAR Nationwide Series auto race at Daytona International Speedway in Daytona Beach, Fla., Saturday, Feb. 23, 2013. (AP Photo/Phelan M. Ebenhack)

Photo: Phelan M. Ebenhack, Associated Press

Driver Kyle Larson gets out of his car, which is missing the...

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DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32 Clorox Chevrolet, and Regan Smith, driver of the #7 Clean Coal Chevrolet, are involved in an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Matthew Stockman/Getty Images)

Photo: Matthew Stockman, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32...

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DAYTONA BEACH, FL - FEBRUARY 23: The #31 Brandt Chevrolet, driven by Justin Allgaier, is seen following an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Jerry Markland/Getty Images)

Photo: Jerry Markland, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: The #31 Brandt Chevrolet, driven...

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Emergency officials put out a fire from driver Kyle Larson's engine after his car hit the wall and safety fence along the front grandstands on the final lap of a NASCAR Nationwide Series auto race at Daytona International Speedway in Daytona Beach, Fla., Saturday, Feb. 23, 2013.(AP Photo/Phelan M. Ebenhack)

DAYTONA BEACH, FL - FEBRUARY 23: Debris from the #32 Clorox Chevrolet, driven by Kyle Larson, is removed from the stands following an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Matthew Stockman/Getty Images)

Photo: Matthew Stockman, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Debris from the #32 Clorox...

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Injured spectators are treated after a crash at the conclusion of the NASCAR Nationwide Series auto race Saturday, Feb. 23, 2013, at Daytona International Speedway in Daytona Beach, Fla. Driver Kyle Larson's car hit the safety fence sending car parts and other debris flying into the stands. (AP Photo/David Graham)

Photo: David Graham, Associated Press

Injured spectators are treated after a crash at the conclusion of...

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Pieces of Kyle Larson's car fly through the air as he slides down the front stretch after he was involved in a multi-car crash on the final lap of the NASCAR Nationwide Series auto race at Daytona International Speedway, Saturday, Feb. 23, 2013, in Daytona Beach, Fla. (AP Photo/John Raoux)

DAYTONA BEACH, FL - FEBRUARY 23: Brad Keselowski, driver of the #22 Discount Tire Dodge, and Kyle Larson, driver of the #32 Clorox Chevrolet, are involved in an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Matthew Stockman/Getty Images) *** BESTPIX ***

Photo: Matthew Stockman, Getty Images

DAYTONA BEACH, FL - FEBRUARY 23: Brad Keselowski, driver of the...

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Kyle Larson, left, slides to a stop near Regan Smith (7) after a wreck at the conclusion of the NASCAR Nationwide Series auto race Saturday, Feb. 23, 2013, at Daytona International Speedway in Daytona Beach, Fla. (AP Photo/Chris O'Meara)

Photo: Chris O'Meara, Associated Press

Kyle Larson, left, slides to a stop near Regan Smith (7) after a...

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Kyle Larson's car comes apart after a crash at the conclusion of the NASCAR Nationwide Series auto race Saturday, Feb. 23, 2013, at Daytona International Speedway in Daytona Beach, Fla. (AP Photo/Chris O'Meara)

Photo: Chris O'Meara, Associated Press

Kyle Larson's car comes apart after a crash at the conclusion of...

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Kyle Larson's car leaves a trail of flames following a crash at the conclusion of the NASCAR Nationwide Series auto race Saturday, Feb. 23, 2013, at Daytona International Speedway in Daytona Beach, Fla. (AP Photo/Chris O'Meara)

Photo: Chris O'Meara, Associated Press

Kyle Larson's car leaves a trail of flames following a crash at the...

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DAYTONA BEACH, FL - FEBRUARY 23: Kyle Larson, driver of the #32 Clorox Chevrolet, and Regan Smith, driver of the #7 Clean Coal Chevrolet, are involved in an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida. (Photo by Matthew Stockman/Getty Images)

Daytona Beach, Fla. -- At least 33 NASCAR fans were injured Saturday when a car sailed into the fence at Daytona International Speedway, and large chunks of debris - including a tire - flew into the grandstand. No fatalities were reported from the accident on the last lap of the Nationwide Series race.

The crash began as the field closed in on the finish line with leader Regan Smith trying to hold off Brad Keselowski, the two making contact. As cars began wrecking, Tony Stewart slid through for the win and rookie Kyle Larson's car went airborne into the fence that separates the track from the seats.

Large chunks of Larson's car landed in the grandstands, and one of his tires appeared to fly over the fence and land midway up the lower section. The car's entire front end sheared off, with the burning engine wedged through a gaping hole in the fence.

As emergency workers tended to injured fans and ambulance sirens wailed in the background, a somber Stewart skipped the post-race victory celebration.

"The important thing is what's going on on the front stretch right now," said Stewart, the three-time NASCAR champion who won for the 19th time at Daytona. "We've always known, and since racing started, this is a dangerous sport. But it's hard. We assume that risk, but it's hard when the fans get caught up in it. ... I could see it all in my mirror, and it didn't look good from where I was at."

Halifax Health spokesman Byron Cogdell said 12 people were transported to Halifax Health Medical Center in Daytona Beach and six others were taken to Halifax Health Medical Center of Port Orange. All were in stable condition, although Cogdell said two people arrived in critical condition, and one of those had life-threatening injuries. Both were upgraded to stable condition.

At least one fan at another hospital was in good condition, and several of the injured were treated at the track and released.

It was a chaotic finish to a race that was stopped for nearly 20 minutes five laps from the finish by a 13-car accident that sent driver Michael Annett to a local hospital with bruising of his chest.

The race resumed with three laps to go, and the final accident occurred when Smith admittedly tried to block Keselowski to preserve the win.